The U.S. State Department is offering a reward of $1 million for information leading to the location of Hamza bin Laden, the son of 9/11 mastermind Osama bin Laden.

The government says Hamza bin Laden “is emerging as a leader” of al-Qaida, posting videos on the Internet calling for attacks on the U.S. and its western allies. He is particularly interested in exacting “revenge” against the U.S. for its 2011 killing of his father, the State Department says.

The U.S. added the young bin Laden to its terror blacklist in 2017 and froze his assets in the U.S., finding that he was “actively engaged in terrorism.”

According to the State Department, Hamza bin Laden is in his early thirties and married to the daughter of Mohammed Atta, the lead hijacker in the Sept. 11 terror attacks against the World Trade Center. Letters seized from Osama bin Laden’s compound in Abbottabad, Pakistan, “indicate that he was grooming Hamza to replace him as leader of al-Qa’ida,” the State Department said.

“He could be anywhere,” said Michael Evanoff, an assistant secretary for diplomatic security at the State Department, according to USA Today. Evanoff said Hamza bin Laden is…